<?php
/*会议系统分享接口*/
class JSSDK {
    private $appId;
    private $appSecret;
    private $tijiaourl;

    public function __construct($appId, $appSecret ,$tijiaourl) {
        $this -> appId = $appId;
        $this -> appSecret = $appSecret;
        $this -> tijiaourl = $tijiaourl;
    }

    public function getSignPackage() {
        $jsapiTicket = $this -> getJsApiTicket();

        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
//		$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        $url = $this -> tijiaourl;

        $timestamp = time();
        $nonceStr = $this -> createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array("appId" => $this -> appId, "nonceStr" => $nonceStr, "timestamp" => $timestamp, "url" => $url, "signature" => $signature, "rawString" => $string);
        return $signPackage;
    }

    private function createNonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    private function getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode($this -> get_php_file("../jsapi/jsapi_ticket.php"));
        if ($data -> expire_time < time()) {
            $accessToken = $this -> getAccessToken();
            // 如果是企业号用以下 URL 获取 ticket
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode($this -> httpGet($url));
            $ticket = $res -> ticket;
            if ($ticket) {
                $data -> expire_time = time() + 7000;
                $data -> jsapi_ticket = $ticket;
                $this -> set_php_file("../jsapi/jsapi_ticket.php", json_encode($data));
            }
        } else {
            $ticket = $data -> jsapi_ticket;
        }

        return $ticket;
    }

    private function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode($this -> get_php_file("../jsapi/access_token.php"));
        if ($data -> expire_time < time()) {
            // 如果是企业号用以下URL获取access_token
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this -> httpGet($url));
            $access_token = $res -> access_token;
            if ($access_token) {
                $data -> expire_time = time() + 7000;
                $data -> access_token = $access_token;
                $this -> set_php_file("../jsapi/access_token.php", json_encode($data));
            }
        } else {
            $access_token = $data -> access_token;
        }
        return $access_token;
    }

    private function httpGet($url) {
        //  $curl = curl_init();
        //  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        //  curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        //  // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
        //  // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
        //  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
        //  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);
        //  curl_setopt($curl, CURLOPT_URL, $url);
        //
        //  $res = curl_exec($curl);
        //  curl_close($curl);
        //
        //  return $res;
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        // curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
        // curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

        $temp = curl_exec($ch);
        curl_close($ch);
        return $temp;
    }

    private function get_php_file($filename) {
        return trim(substr(file_get_contents($filename), 15));
    }

    private function set_php_file($filename, $content) {
        $fp = fopen($filename, "w");
        fwrite($fp, "<?php exit();?>" . $content);
        fclose($fp);
    }

}

$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

$tjurl = isset($_REQUEST["url"]) ? $_REQUEST['url'] : $url;

//正式环境
$jssdk = new JSSDK("wxc6e0d0ef6ada62b3", "325fab0fe27f6cbcf28ff476e3cff39b", $tjurl);
//测试号
//$jssdk = new JSSDK("wx7cb720f0663ac677", "526ce2e7a54cb9d6d4818e10dc200950", $tjurl);

$signPackage = $jssdk->getSignPackage();

echo json_encode($signPackage);

exit;
